LIKE expressions are of the form:
identifier [NOT] LIKE pattern-value [ESCAPE escape-character]
where identifier has a String value; pattern-value is a string literal
where '_' stands for any single character; '%' stands for any sequence of
characters, including the empty sequence, and all other characters stand
for themselves. The optional escape-character is a single-character
string literal whose character is used to escape the special meaning of
the '_' and '%' in pattern-value.